Evaluation of a low-pressure membrane filtration for drinking water treatment: pretreatment by coagulation/sedimentation for the MF membrane

Moon, Jihee; Kang, Moon Sun; Lim, Jae Lim; Kim, Choong Hwan; Park, Hee Deung

doi:10.1016/j.desal.2008.12.030

Cited by 47 publications

(21 citation statements)

References 14 publications

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“…It is recognised that pre-coagulation of dissolved organic matter upstream of MF/UF membranes reduces fouling as well as enhancing removal of organic material that otherwise is not largely removed by microporous membranes [16]. Against this, overdosing with coagulant may exacerbate membrane fouling, especially for the RO membrane [17]. Chloramination/chlorination was used at six plants, ostensibly to suppress biofouling of the membrane by inactivating microorganisms and oxidising organic material.…”

Section: Pre-treatmentmentioning

confidence: 99%

Wastewater polishing using membrane technology: a review of existing installations

Raffin

Germain

Judd

2013

Environmental Technology

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The use of membrane technology for municipal wastewater reuse is growing in importance worldwide as water becomes increasingly scarce. A review of nine membrane technology-based water reuse plants from across the world has been conducted to provide an insight into the trends in design and operation of these plants, and elucidate the impact of key water quality and other determinants. Data reveal a number of common elements, such as the design flux for the reverse osmosis membrane, as well as a number of other trends. The microfiltration/ultrafiltration (MF/UF) backwash interval appears to correlate better with feed water temperature than turbidity or total suspended solids, whereas chemical cleaning requirements are more dependent on plant operating parameters and water quality. There is some indication that the MF/UF pore size influences the filtrate turbidity (and silt density index) and so downstream reverse osmosis fouling and cleaning. Finally, specific energy demand (SED) values vary widely, from 0.8 to 2.3 kWh m(-3) permeate. Whilst the SED for the MF/UF process follows the flux, the overall energy demand shows no apparent dependence on the dissolved solids concentration or other feed water quality determinants. This range of energy demand amounts to 25-70% of the energy demand for seawater desalination.

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Section: Pre-treatmentmentioning

confidence: 99%

Wastewater polishing using membrane technology: a review of existing installations

Raffin

Germain

Judd

2013

Environmental Technology

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“…Pretreatment before UF, especially by "in-line" chemical coagulation or coagulation-hydraulic flocculation, has been shown to be an effective way to control membrane fouling [6][7][8], and improve general water quality [1,9,10]. However, not all contaminants can be fully removed by the coagulation process, particularly biopolymers, such as polysaccharides and proteins [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Investigation of pre-coagulation and powder activate carbon adsorption on ultrafiltration membrane fouling

et al. 2014

Journal of Membrane Science

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a b s t r a c tPre-coagulation by alum before ultrafiltration without (CUF) and with (CAUF) powdered activated carbon (PAC) addition was investigated to explore the influence of PAC on membrane fouling. It was found that the continuous addition of a low dosage of PAC reduced membrane fouling for operational run periods o20 days, both for reversible and for irreversible components of fouling. The presence of PAC increased the removal of dissolved organic matter (DOM), particularly proteinaceous substances, and some fractions of humic-type substances. For a longer operation time (420 days) an increase in mainly reversible fouling was evident and was attributed to microorganism growth in the cake layer, as indicated by the enhanced concentrations of extracellular polymeric substances, such as polysaccharides and proteins. A process of crystallization of the coagulant floc in the cake layer with increasing operation time was believed to cause desorption of DOM from primary coagulation particles and a decrease in their size, and consequently a higher density of cake layer. PAC absorption of desorbed DOM within the cake layer, and residual DOM after coagulation, reduced DOM reaching the membrane surface and the extent of subsequent internal membrane fouling.Crown

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“…It has been extensively used as a separation technique in the dairy industry (Tarazaga et al, 2006). UF membrane technology in the treatment of heavy metal ions has been shown to be an effective and cheap approach, not only could it improve general water quality (Moon et al, 2009;Rojas et al, 2011), but also it could control membrane fouling (Konieczny et al, 2009;Listiarini et al, 2009;Peiris et al, 2013;Wray et al, 2014;Yu and Graham, 2015). On the other hand, membrane separation technique has shown great promise for metal ion removal due to its high efficiency, space saving, low cost, and easy operation.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of novel polyvinylidene fluoride ultrafiltration membranes for separation of Cr(VI) from wastewater

Wang

et al. 2016

Adsorption Science & Technology

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Hexavalent chromium is one of the major heavy metals. As the environmental legislation becomes increasingly strict, looking for new technology to treat hexavalent chromium is becoming more and more important. In this research, 2-mercaptobenzothiazole was used to blend polyvinylidene fluoride to prepare a modified membrane that could be applied to adsorb and purify water containing hexavalent chromium. The membrane performance was characterized by infrared spectroscopy (Fourier transform infrared spectroscopy) and water contact angle measurements. The experimental results showed that the pure water flux of the membrane was 255.57 l/m 2 h, the contact angle was 80.1 , and the adsorption capacity of chromium ion was 241 mg/cm 2 . The polyvinylidene fluoride-modified membrane presented better adsorption abilities for chromium ion than that of the traditional polyvinylidene fluoride membrane.

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Evaluation of a low-pressure membrane filtration for drinking water treatment: pretreatment by coagulation/sedimentation for the MF membrane

Cited by 47 publications

References 14 publications

Wastewater polishing using membrane technology: a review of existing installations

Wastewater polishing using membrane technology: a review of existing installations

Investigation of pre-coagulation and powder activate carbon adsorption on ultrafiltration membrane fouling

Fabrication and characterization of novel polyvinylidene fluoride ultrafiltration membranes for separation of Cr(VI) from wastewater

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